This rich, flavorful gratin dish makes a fantastic light supper or lunch main course. It also happens to be gluten-free and kosher for passover -- go figure.
Spinach and Roasted Red Pepper Gratin adapted from Epicurious

Char peppers directly over gas flame or in broiler until blackened on all sides. Enclose in paper bag; let stand 10 minutes. Peel, seed, and slice peppers into 1/4-inch-wide strips.

Melt butter with oil in heavy large skillet over medium heat. Add leeks, shallot, and garlic; cook until soft, about 5 minutes. Remove from heat. Whisk cream and eggs in large bowl to blend. Whisk in all cheeses, salt, and pepper. Stir in spinach, leek mixture, and 2/3 of roasted red peppers (reserve 1/3 of peppers for topping). (Can be prepared 1 day ahead. Cover and refrigerate.)